PCAP-31-03 4.2 Employ Class and Object Properties PCAP-31 Practice Questions (Page 4)

Questions 16–20

1. 16expert · hard

   A developer is refactoring a class and wants to rename a private instance variable from `__data` to `__info`. The class is used by external code that accesses `obj._ClassName__data`. What is the impact of this rename?

   • AExternal code breaks because the mangled name changes to `_ClassName__info`
   • BExternal code continues to work because mangling is based on the class name only
   • CExternal code breaks only if the class name also changes
   • DExternal code continues to work because private variables are not accessible externally anyway
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2. 17foundation · easy

   What does the __dict__ attribute of an instance contain?

   • AThe instance variables and their values
   • BThe class variables and methods of the class
   • CThe memory address of the instance
   • DThe methods defined in the class
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4. 18foundation · easy

   Given the class definition below, what will be the output of the code? class Car: def __init__(self, brand): self.brand = brand car1 = Car('Toyota') car2 = Car('Honda') print(car1.brand)

   • AError: 'Car' object has no attribute 'brand'
   • BHonda
   • CNone
   • DToyota
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5. 19foundation · easy

   What does the __dict__ attribute of a class contain?

   • AThe instance variables of all objects
   • BThe class variables and methods
   • CThe private variables of the class
   • DThe memory addresses of all instances
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6. 20expert · hard

   A class `Settings` has a class variable `theme = 'light'`. A developer executes: `s = Settings(); s.theme = 'dark'; t = Settings()`. What is the value of `t.theme` and `Settings.theme`?

   • A`t.theme` is 'dark' and `Settings.theme` is 'light'
   • B`t.theme` is 'light' and `Settings.theme` is 'light'
   • C`t.theme` raises AttributeError because theme was overridden
   • D`t.theme` is 'dark' and `Settings.theme` is 'dark'
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